CS-199/254

Celsi ...Temperature Sensing Labels Apply and Forget irreversible temperature level recording labels. Self-adhesive, easy applicable on any sur- face. Forty levels to choose from +40C (105F) to +260C (550F) and arranged in various combinations. Accu- racy 1,5%. Permanent blackening of the original white level clearly indicates that level had been exceeded. CelsiStrip with 5 temperature levels. Also 8 levels (not shown CelsiClock with 5 temperature levels. CelsiClock s are also here) available. Here 60C are exceeded but 77C never reached. available with other temperature values and arrangements. JUMBO-CelsiDot with one level at 93C. Left CDJ exceeded MICRO-CelsiStrip with temperature levels 60 and 71C sure- sometime in the past its 93C level. CDJ to the right not heated. ly exceeded. The 82C never reached in the label s watch mission. CelsiPoint with one 82C level. CP on left side exceeded and CelsiDot s with 93C level and MICRO-CelsiStrips on an on right side never exposed to or above 82C. assembly before test. manufactured by: Spirig Ernest Dipl.-Ing. Postfach 1140 CH-8640 Rapperswil Schweiz SPIRIG Tf: (+41) 55 222 6900 Fax:(+41) 55 222 6969 SWITZERLAND e-shop: www.celsi.com e-mail: info spirig.com E-Shop: www.celsi.com IT2CS00 Funktion 1 / 1 print: 15.06.2003 DIPL.-ING. ERNEST SPIRIG POBOX 1140 HOHLWEG 1 CH-8640 RAPPERSWIL PHONE: (+41) 55 222 6900 FAX: 55 222 6969 INFO SPIRIG.COM WWW.SPIRIG.COM FUNCTION / OPERATION Temperature Recording Labels CelsiStrip CelsiClock CelsiDot CelsiPoint PRINCIPLE OF OPERATION Interpretation of Readings on Labels Aging and other influences might alter the surface The basic function of the CelsiLabel depends on the colour from white to grey. Questions on how to un- melting point (a well defined physical action) rather than a chemical reaction to translate the temperatures level(s) derstand the indication might arise after application. into visible form. There are also temperature indicators on If the thermo sensitive area exposes the black paper the market whose indications are based on chemical reac- background, then its specific temperature has been tions of the indicating materials used. Such chemical reac- exceeded. The background paper is of a deep black tions depend obviously on both the temperature AND the colour. If there is still an uncertainty left, then the fol- exposure time. lowing test will give a clear answer: Carefully remove label from test surface. Use a small hot SPIRIG manufactures only physical response temperature soldering iron tip and touch the heat sensitive area from the recording labels. Exposure time does not alter or modify adhesive side of the label. the readings. If the sensitive area responds within parts of a second by FUNCTION blackening, then that specific temperature level on the label CelsiLabels use the melting point of chemicals. The prin- had not been previously exposed above its rated tempera- ciple is described here in a simplified way. A black blotting ture level. paper is covered with a white chemical coating. The black Reasons for potential errors in applications colour is hidden under the white coating. If the white coat The strip should not be exposed to direct radiation of in- would melt, then the liquefied coating material will be frared heating energy or ultraviolet UV curing light. The drawn by capillary forces into the black paper. The black strip and its heat sensitive surface areas will absorb heat paper becomes visible. radiation at a different absorption rate (or reject heat at a Worst case tolerance: 2,5% (of full scale). different reflection rate) than the target surface the temper- ature should be monitored. A major measurement error The now black paper surface is the 100% irreversible proof might occur. The strip will not measure the surface temper- that the coating exceeded its specific melting point some- ature to which it is applied. The CelsiLabel is put behind a times in the past (seconds or a year) and was in a liquid shield (into theheatin shadow) protecting the state to penetrate the black paper. CelsiLabel from direct exposure to the heat radiation. The CelsiLabel combine chemicals with different melting points, levels arranged in an increasing scale like on a thermometer. RULE NO. 1 Thegrayin of the white sensitive coating is NOT an indi- cation of an exceeded temperature level. It is an aging pro- cess depending on many factors, one of them being time, environment, etc. Graying is not a displacement of the coating material, and consequently the melting point is or was not exceeded. RULE NO. 2 The melting point slightly depends on the ambient air pres- sure imposed on the chemicals. In general materials melt- ing points do depend more or less on the pressures ap- plied. The ratings on the CelsiLabel are for usual ambi- CST 10954 0945r.jpg ent atmospheric pressures between sea level and up to 1000 meters (3000 feet). FUNCTION TEST If an application is either in a pressure or a vacuum cham- Two CelsiStrips are applied here on a 100 mm thick by 250 x 250 ber, the user has tocross-referenc the readings printed mm wide aluminum plate electro heated from below. A thermocou- on the labels against his specific pressure or vacuum in ple wire ends 3 mm deep in a hole in the center of this plate. The use. heavy thermal mass of the plate ensures in the center of its sur- face an even temperature level. The high mass also limits the tem- Shelf life limitation: perature rate of increase (gradient) at a given electric heating in- There is basically no theoretical shelf life limitation on the put. The colour change from white to black can easily and clearly phase change process and dislocation of the thermomelt be seen. The test can also be put on a video, eg using the almost material, however there is a degrading with time and ambi-for fre iMovie software from Apple. With a convenient arrange- ent storage temperature level for thepermeability / wetta- ment it would also be possible tomirror i the the temperature bilit of the black background substrate by the melt materi- measurement values from the electronic thermometer or to store al. Another shelf life limiting factor is the tendency of the the spoken out read values of the meter. adhesive layer todr and loose tackiness with time. Warranty: Spirig Quality Control try s to ship only performing materials. By the nature of Expected shelf life: 12 month after Spirig s delivery. the product a 100% test is impossible. In case of a material failure warranty covers explicitly only the materials exchange provided storage was correct. Storage: Any other warranties, claims or obligations for Spirig towards the customer / Dry, cool, no light and sealed in plastic envelope / sachet. user are explicitly excluded and void.